A PHYSIOLOGICAL CHARACTER. 



57 



For the next year-period (August 1, 1913-July 31, 1914) the 

 means were 406.4 and 439.2 seconds. The difference (-32.8 ±14.5 



Table 21. — Selection summary for Ldne 714- 



seconds) is 2.26 times the probable error. There were 6 rather small 

 same-day broods, for which the mean for the minus strain was 

 105 ±42.82 seconds the larger. Again, as compared with the pre- 



